<!DOCTYPE html>   
<html lang="en">   
<head>   
  <meta charset="UTF-8">   
  <meta name="viewport" content="width=device-width, initial-scale=1.0">   
  <title> Vue入门示例</title>   
</head>   
<body>   
  <div id="app">   
    <input type="text" v-model="youName" placeholder="请输入你的姓名">   
    <h1>Hello, {{ youName }}!</h1>   
  </div>   
  <script src="https://cdn.jsdelivr.net/npm/vue@2"></script>   
  <script>   
    let app = new Vue({   
      el: '#app',   
      data: {   
        youName: ''   
      }   
    })   
  </script>   
</body>   
</html> 